feat: add configurable hotkeys to cycle tabs

Adds two configurable hotkeys (plus the required code infrastructure to
handle configurable hotkeys) for cycling the active chat tab forward by
one and backwards by one.

ChatTwo/Ui/ChatLogWindow.cs

@@ -41,6 +41,7 @@ public sealed class ChatLogWindow : Window
 
     internal Vector4 DefaultText { get; set; }
 
+    internal int? WantedTab { get; set; }
     internal Tab? CurrentTab
     {
         get
@@ -348,6 +349,34 @@ public sealed class ChatLogWindow : Window
         if (ImGui.GetIO().KeyShift)
             modifierState |= ModifierFlag.Shift;
 
+        bool KeyPressed(VirtualKey vk, ModifierFlag modifier)
+        {
+            if (!vk.TryToImGui(out var key))
+                return false;
+
+            var modifierPressed = Plugin.Config.KeybindMode switch
+            {
+                KeybindMode.Strict => modifier == modifierState,
+                KeybindMode.Flexible => modifierState.HasFlag(modifier),
+                _ => false,
+            };
+
+            return ImGui.IsKeyPressed(key) && modifierPressed && (modifier != 0 || !modifiersOnly);
+        }
+
+        // Test for custom keybinds for changing chat tabs before checking
+        // vanilla keybinds.
+        if (Plugin.Config.ChatTabBackward != null && KeyPressed(Plugin.Config.ChatTabBackward.Key, Plugin.Config.ChatTabBackward.Modifier))
+        {
+            Plugin.ChatLogWindow.ChangeTabDelta(-1);
+            return;
+        }
+        if (Plugin.Config.ChatTabForward != null && KeyPressed(Plugin.Config.ChatTabForward.Key, Plugin.Config.ChatTabForward.Modifier))
+        {
+            Plugin.ChatLogWindow.ChangeTabDelta(1);
+            return;
+        }
+
         var turnedOff = new Dictionary<VirtualKey, (uint, string)>();
         foreach (var (toIntercept, keybind) in Plugin.Functions.Chat.Keybinds)
         {
@@ -356,17 +385,7 @@ public sealed class ChatLogWindow : Window
 
             void Intercept(VirtualKey vk, ModifierFlag modifier)
             {
-                if (!vk.TryToImGui(out var key))
-                    return;
-
-                var modifierPressed = Plugin.Config.KeybindMode switch
-                {
-                    KeybindMode.Strict => modifier == modifierState,
-                    KeybindMode.Flexible => modifierState.HasFlag(modifier),
-                    _ => false,
-                };
-
-                if (!ImGui.IsKeyPressed(key) || !modifierPressed || modifier == 0 && modifiersOnly)
+                if (!KeyPressed(vk, modifier))
                     return;
 
                 var bits = BitOperations.PopCount((uint) modifier);
@@ -395,6 +414,16 @@ public sealed class ChatLogWindow : Window
         }
     }
 
+    internal void ChangeTab(int index) => WantedTab = index;
+
+    internal void ChangeTabDelta(int offset)
+    {
+        var newIndex = (LastTab + offset) % Plugin.Config.Tabs.Count;
+        while (newIndex < 0)
+            newIndex += Plugin.Config.Tabs.Count;
+        ChangeTab(newIndex);
+    }
+
     private void TabChannelSwitch(Tab tab)
     {
         // Save the previous channel to restore it later
@@ -1158,7 +1187,10 @@ public sealed class ChatLogWindow : Window
                 continue;
 
             var unread = tabI == LastTab || tab.UnreadMode == UnreadMode.None || tab.Unread == 0 ? "" : $" ({tab.Unread})";
-            using var tabItem = ImRaii.TabItem($"{tab.Name}{unread}###log-tab-{tabI}");
+            var flags = ImGuiTabItemFlags.None;
+            if (WantedTab == tabI)
+                flags |= ImGuiTabItemFlags.SetSelected;
+            using var tabItem = ImRaii.TabItem($"{tab.Name}{unread}###log-tab-{tabI}", flags);
             DrawTabContextMenu(tab, tabI);
 
             if (!tabItem.Success)
@@ -1174,6 +1206,7 @@ public sealed class ChatLogWindow : Window
             DrawMessageLog(tab, PayloadHandler, GetRemainingHeightForMessageLog(), switchedTab);
         }
 
+        WantedTab = null;
         return currentTab;
     }
 
@@ -1203,10 +1236,10 @@ public sealed class ChatLogWindow : Window
                         continue;
 
                     var unread = tabI == LastTab || tab.UnreadMode == UnreadMode.None || tab.Unread == 0 ? "" : $" ({tab.Unread})";
-                    var clicked = ImGui.Selectable($"{tab.Name}{unread}###log-tab-{tabI}", LastTab == tabI);
+                    var clicked = ImGui.Selectable($"{tab.Name}{unread}###log-tab-{tabI}", LastTab == tabI || WantedTab == tabI);
                     DrawTabContextMenu(tab, tabI);
 
-                    if (!clicked)
+                    if (!clicked && WantedTab != tabI)
                         continue;
 
                     currentTab = tabI;
@@ -1229,6 +1262,7 @@ public sealed class ChatLogWindow : Window
         if (currentTab > -1)
             DrawMessageLog(Plugin.Config.Tabs[currentTab], PayloadHandler, childHeight, switchedTab);
 
+        WantedTab = null;
         return currentTab;
     }